package com.sky.interceptor;

import com.sky.exception.BaseException;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        try {
            // 从请求头获取令牌
            String token = request.getHeader(jwtProperties.getAdminTokenName());
            
            // 记录日志
            log.info("jwt校验:{}", token);
            
            // 检查token是否为空
            if (token == null || token.trim().isEmpty()) {
                log.error("JWT令牌为空");
                throw new BaseException("JWT令牌不能为空");
            }

            // 校验令牌
            JwtUtil.parseJWT(jwtProperties.getAdminSecretKey(), token);

            // 返回true表示放行
            return true;
        } catch (BaseException ex) {
            // 重新抛出业务异常，让全局异常处理器处理
            throw ex;
        } catch (Exception ex) {
            // 记录异常日志
            log.error("JWT令牌校验失败：{}", ex.getMessage());
            throw new BaseException("JWT令牌校验失败：" + ex.getMessage());
        }
    }
}
